Driveshaft Shop Rear Axle Bar and Internal CV Upgrade, BMW F8X M3 / M4 740Li E-Flash allows the end user

E-Flash allows the end user to upload the supercharger ECU software from any PC running Windows 7 or newer

this shaft features a slider system that will let the shaft move in and out during racing and chassis flex

Equal Runner Design

60 A transient (typical)

Driveshaft Shop Rear Axle Bar and Internal CV Upgrade, BMW F8X M3 / M4 740Li E-Flash allows the end userUpgrade your BMW F80 M3, F82 M4, or F83 M4 with the Driveshaft Shop Rear Axle Bar and Inner CV Upgrade, designed to handle up to 1200HP. This service strengthens your factory axles with 36 spline high grade aircraft quality bars, a Chromoly 108mm inner CV, and reinforced outer CV internals for unmatched durability. Key Features: 36 spline axle bars (OEM has 28 splines) for improved strength Chromoly 108mm inner CV with aerospace grade internals